http://www.cnr.it/ontology/cnr/individuo/prodotto/ID184705
Variation in nitrogen supply changes water-use efficiency of Pseudotsuga menziesii and Populus x euroamericana; a comparison of three different approaches to determine water-use efficiency (Articolo in rivista)
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- Variation in nitrogen supply changes water-use efficiency of Pseudotsuga menziesii and Populus x euroamericana; a comparison of three different approaches to determine water-use efficiency (Articolo in rivista) (literal)
- Anno
- 2004-01-01T00:00:00+01:00 (literal)
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Ripullone F. (1); Lauteri M. (2); Grassi G. (3); Amato M. (1); Borghetti M (1) (2004)
Variation in nitrogen supply changes water-use efficiency of Pseudotsuga menziesii and Populus x euroamericana; a comparison of three different approaches to determine water-use efficiency
in Tree physiology; heron publishing, victoria (Canada)
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- Ripullone F. (1); Lauteri M. (2); Grassi G. (3); Amato M. (1); Borghetti M (1) (literal)
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- 1) Dipartimento di Produzione Vegetale, Università della Basilicata, 85100 Potenza, Italy;
2) Istituto di Biologia Agro-ambientale e Forestale, CNR, Porano, Italy;
3) Dipartimento di Colture Arboree, Università di Bologna, Bologna, Italy (literal)
- Titolo
- Variation in nitrogen supply changes water-use efficiency of Pseudotsuga menziesii and Populus x euroamericana; a comparison of three different approaches to determine water-use efficiency (literal)
- Abstract
- We studied the effects of three nitrogen (N) supply rates (low, intermediate and high) on Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings and poplar clone \"I-214\" (Populus x euroamericana (Dole) Guinier) cuttings growing in mini-stands. Our specific objectives were to: (1) evaluate the effects of N supply on water-use efficiency (WUE) and biomass production; (2) determine if N affects WUE through control of carbon assimilation rates or through stomatal control of water loss; and (3) compare three methods of estimating WUE: one short-term method (WUEi, based on gas exchange measurements) and two long-term methods (WUET, based on the ratio between biomass production and transpired water, and Delta, based on leaf carbon isotope discrimination tested as a proxy of WUE). In both species, biomass production, WUEi and WUET increased with increasing N supply, but there was no effect of N supply on either transpiration or stomatal conductance and A was negatively related to leaf N concentration. Plots of A versus both WUEi and WUET revealed negative trends, but the regression between WUEi and Delta was significant only for Douglas-fir, and the regression between WUET and Delta was significant only for poplar. Thus, the mechanisms underlying the response of WUE to N supply were mainly related to a positive effect of N supply on photosynthetic rates. The data confirm that carbon isotope discrimination may be a useful proxy of WUE. The finding that N availability enhances both biomass production and WUE may have practical implications in regions where these factors impose constraints on forest productivity. (literal)
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